package com.oxygen.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.util.Random;

/**
 * 随机验证码工具类
 * 
 * @author daniel
 */
public class RandomValidateCodeUtil {

//	public static final String RANDOMCODEKEY = "RANDOMVALIDATECODEKEY";// 放到session中的key
	private Random random = new Random();
	private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";// 随机产生的字符串

	private int width;// 图片宽
	private int height;// 图片高
	private int lineSize;// 干扰线数量
	private int stringNum;// 随机产生字符数量

//	public static void main(String[] args) {
//		// useage as follows:
//		HttpServletRequest request = null;
//		HttpServletResponse response = null;
//		response.setContentType("image/jpeg");// 设置相应类型,告诉浏览器输出的内容为图片
//		response.setHeader("Pragma", "No-cache");// 设置响应头信息，告诉浏览器不要缓存此内容
//		response.setHeader("Cache-Control", "no-cache");
//		response.setDateHeader("Expire", 0);
//		RandomValidateCodeUtil randomValidateCode = new RandomValidateCodeUtil(80, 26, 40, 4);
//		try {
//			randomValidateCode.getRandcode(request, response);// 输出图片方法
//		} catch (Exception e) {
//			e.printStackTrace();
//		}
//	}

	public RandomValidateCodeUtil(int width, int height, int lineSize, int stringNum) {
		this.width = width;// 图片宽
		this.height = height;// 图片高
		this.lineSize = lineSize;// 干扰线数量
		this.stringNum = stringNum;// 随机产生字符数量
	}

	/*
	 * 获得字体
	 */
	private Font getFont() {
		return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
	}

	/*
	 * 获得颜色
	 */
	public Color getRandColor(int fc, int bc) {
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc - 16);
		int g = fc + random.nextInt(bc - fc - 14);
		int b = fc + random.nextInt(bc - fc - 18);
		return new Color(r, g, b);
	}

	/**
	 * 生成随机图片
	 */
//	public void getRandcode(HttpServletRequest request, HttpServletResponse response) {
//		HttpSession session = request.getSession();
//		// BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
//		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
//		Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
//		g.fillRect(0, 0, width, height);
//		g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));
//		g.setColor(getRandColor(110, 133));
//		// 绘制干扰线
//		for (int i = 0; i <= lineSize; i++) {
//			drowLine(g);
//		}
//		// 绘制随机字符
//		String randomString = "";
//		for (int i = 1; i <= stringNum; i++) {
//			randomString = drowString(g, randomString, i);
//		}
//		session.removeAttribute(RANDOMCODEKEY);
//		session.setAttribute(RANDOMCODEKEY, randomString);
//		// System.out.println(randomString);
//		g.dispose();
//		try {
//			ImageIO.write(image, "JPEG", response.getOutputStream());// 将内存中的图片通过流动形式输出到客户端
//		} catch (Exception e) {
//			e.printStackTrace();
//		}
//	}

	/*
	 * 绘制字符串
	 */
	public String drowString(Graphics g, String randomString, int i) {
		g.setFont(getFont());
		g.setColor(new Color(random.nextInt(101), random.nextInt(111), random.nextInt(121)));
		String rand = String.valueOf(getRandomString(random.nextInt(randString.length())));
		randomString += rand;
		g.translate(random.nextInt(3), random.nextInt(3));
		g.drawString(rand, 13 * i, 16);
		return randomString;
	}

	/*
	 * 绘制干扰线
	 */
	public void drowLine(Graphics g) {
		int x = random.nextInt(width);
		int y = random.nextInt(height);
		int xl = random.nextInt(13);
		int yl = random.nextInt(15);
		g.drawLine(x, y, x + xl, y + yl);
	}

	/*
	 * 获取随机的字符
	 */
	public String getRandomString(int num) {
		return String.valueOf(randString.charAt(num));
	}

	public Random getRandom() {
		return random;
	}

	public void setRandom(Random random) {
		this.random = random;
	}

	public String getRandString() {
		return randString;
	}

	public void setRandString(String randString) {
		this.randString = randString;
	}

	public int getWidth() {
		return width;
	}

	public void setWidth(int width) {
		this.width = width;
	}

	public int getHeight() {
		return height;
	}

	public void setHeight(int height) {
		this.height = height;
	}

	public int getLineSize() {
		return lineSize;
	}

	public void setLineSize(int lineSize) {
		this.lineSize = lineSize;
	}

	public int getStringNum() {
		return stringNum;
	}

	public void setStringNum(int stringNum) {
		this.stringNum = stringNum;
	}
	
	
}